Specific heat study of the superconducting and normal states in FeSe1-xTex (0.6<=x<=1) single crystals

Physics – Condensed Matter – Superconductivity

Scientific paper

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19 pages, 1 table, 4 figures

Scientific paper

The electronic specific heat of as-grown and annealed single-crystals of FeSe1-xTex (0.6\leqx\leq1) has been investigated. It has been found that annealed single-crystals of x=0.6-0.9 exhibit bulk superconductivity with a clear specific-heat jump at the superconducting (SC) transition temperature, Tc. Both 2Delta_0/kBTc [Delta_0: the SC gap at 0 K estimated using the single-band BCS s-wave model] and DeltaC/(gamma_n-gamma_0)Tc [DeltaC: the specific-heat jump at Tc, gamma_n: the electronic specific-heat coefficient in the normal state, gamma_0: the residual electronic specific-heat coefficient at 0 K in the SC state] are largest in the well annealed single-crystal of x=0.7 and are 4.29 and 2.38, respectively, indicating that the superconductivity is strong-coupling. The gamma_n value has been found to be one order of magnitude larger than those estimated from the band calculations and increases with increasing x at x=0.6-0.9, which is guessed to be due to the enhancement of the electronic effective mass, namely, the enhancement of the electron correlation. It has been found that there remains a finite value of gamma_0 in the SC state even in the well annealed single-crystals of x=0.8-0.9, suggesting an inhomogeneous electronic state in the real space and/or momentum space.

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